/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/
function promise1(params) {
  return new Promise(resolve=>{
    setTimeout(() => {
      resolve (params)
    }, 10);
  })
    
}
promise1('hello').then(res=>promise1(res+'lagou')).then(res=>promise1(res+'I ♥ U')).then(res=>console.log(res))
